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jsp实现简单用户登录（用户7天内免登录）

（1）登陆页面：login.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<form action="LoginServlet" method="post">用户名：<input type="text" name="username" value="${cookie.cook_name.value }"/><br/><input type="checkbox"  name="chkCookie" value="7"/>记住我，7天内免登录<br/><input type="submit" value="登录"/><br/><a href="sessionUser.jsp">验证session</a><a href="cookieUser.jsp">验证cookie</a>
</form>
</body>
</html>

（2）跳转页面：cookieUser.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<% //从浏览器获取cookieCookie[] cookies = request.getCookies();String uname = null;//判断语句条件小技巧if(null != cookies){for(Cookie cookie:cookies){//遍历本地浏览器中的所有cookieif(cookie.getName().equals("cook_name")){//把cookie中的用户名取出uname = cookie.getValue();}//out.print("<p>name: " + cookie.getName()+"</p>");//out.print("<p>value: " + cookie.getValue()+"</p>");}}//判断cookie有没有失效if(null != uname){out.print("<p>用户名："+uname +"</p>");}else{response.sendRedirect("login.jsp");}
%>
</body>
</html>

（3）Servlet文件：LoginServlet类

package com.servlet;import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;/*** Servlet implementation class LoginServlet*/
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public LoginServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub//获取用户登录名String username = request.getParameter("username");//获取7天内是否免登录String day7 = request.getParameter("chkCookie");int cookie_day = 1;if(null != day7 && day7.equals("")){cookie_day = Integer.valueOf(day7);}//创建cookieCookie cookie  = new Cookie("cook_name",username);//设置Cookie有限期//cookie.setMaxAge(6);//有效期6秒cookie.setMaxAge(3600 * 24 * cookie_day);//设置7天免登录//写入cookie到浏览器response.addCookie(cookie);response.sendRedirect("cookieUser.jsp");}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

本文标签： jsp实现简单用户登录（用户7天内免登录）

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